• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

1980 GS250 "dirty little brat"

  • Thread starter Thread starter nikola25
  • Start date Start date
I don't recall if you've checked the valve clearances or not, but that can definitely be a cause of hard starting if they're not right...
 
nikola25 said:
The bike cranks as normal unless I pull on the choke in which it suddenly really really struggles or stops cranking (can this tell me anything?)
Click to expand...

Could be you timing is way too far advanced. You pull the choke, it fires once, but it is too far before top dead center so it stops the piston moving up. Check the ignition timing again.
 
Pull the valve cover and check that the cams are timed right. That said, it brings to mind something that happened on the way home from the PNW ralley last year....are you sure that your exhaust is not plugged? We found that not only does a bike need spark, fuel, and air, but needs to breath out as well, or it will not run.
V
 
gustovh said:
Pull the valve cover and check that the cams are timed right. That said, it brings to mind something that happened on the way home from the PNW ralley last year....are you sure that your exhaust is not plugged? We found that not only does a bike need spark, fuel, and air, but needs to breath out as well, or it will not run.
V
Click to expand...

Hah, I learned that one years ago. I used to have this honda c70 scooter forever that didn't run, never could get it to do anything, even with starting fluid. One day I'm out messing with it again, and looked down at the exhaust and saw something brown in the end of it, was a some kind of bee nest, made out of dirt or mud or something. Broke it up with a screw driver, kicked the old passport over, and it spit out 4 dead bees, chunks of nest, and came to life :rolleyes:
 
The pipes are clear for sure as I made the exhaust custom. I actually had nearly the same thing happen to me with a honda cub (hornet's nest inside the pipe) Timing/valves is most likely the issue. I've never done valves (except on my brother Royal Enfield which is ridiculous easy) or timing before which and am nervous about opening up the top of the bike but I suppose it's time to learn.
 
Take your time, double check everything you do, be careful, and it's a lot easier than you think.

Definitely daunting at first, but definitely doable!
 
What do I need for tools/parts to do the timing and valves? Valve cover gasket and...?
 
Have a read up on the processes on BassCliff's site... they'll steer you in the right direction.

At a minimum I would say valve cover gasket and feeler gauges.

Given yours is the 4 valve per cylinder motor, I'm pretty sure you will have screw and locknut type adjustments for the clearances, and I'm pretty sure there's a write up on how to make a very handy tool to adjust these on BassCliff's site as well.

I've only done shims on my 2 valve motor so can't comment on that one...
 
Ugh..... bad news. The compression tests today showed 60 in each cylinder ; ; I thought it might be the tool since i got a harbor freight cheapo and tested my gn250 and the results there were 140+ psi so it works fine and my motor is.... well screwed. When I added oil in the port it increased to 90 psi for a half dozen cranks. That means rings correct? and possibly cylinder walls? With this issue and the clutch not working on it (shifts fine but clutch doesnt work) I'm debating between full teardown/rebuild in a couple of months when we move into our new place or just buying a working used motor. I found a complete running bike for 700 and was just thinking of pulling the motor from that.
 
It could be rings for sure, but you really need to check your valve clearances too as they can affect compression if they're too tight.

If you can get it over 100psi wet then you could be ok.

Stupid question but are you holding the throttle wide open while cranking?
 
Sorry if you've mentioned it, but what is the exhaust you are using?
 
You must log in or register to reply here.

Similar threads

G
Should i powder coat at this point
Replies
11
Views
1K
Guest
G
K
East tn bobber
Replies
9
Views
1K
kvillebuckeye
K
S
1982 GS650E project
Replies
7
Views
468
speedyb166
S
cowboyup3371
81 GS550T Full Rebuild...In Ohio
19 20 21
Replies
400
Views
40K
rustywvw
R
B
My humble project.
Replies
14
Views
1K
BoneDaddy
B
Back
Top